Attachment for raising and lowering desks



(No Model.)

J.AV. EADES.

ATTACHMENT FOR RAISING AND LOWERING DBSKS. No. 266,792.

Patented Oct. 31, 1882.

g 0 0 0 a 0 E 2 Q 5/ W W UNITED STATES ATENT OFFICE.

J. ALVIN EADES, OF MIDDLETOWN, CONNECTICUT.

ATTACHMENT FOR RAISING AND LOWERING DESKS.

SPECIFIGATION forming part of Letters Patent No. 266,792, dated October31, 1882.

Application filed April '7, 1882.

To all whom it may concern:

Be it known that I, J. ALVIN EADns, of Middletown, in the county ofMiddlesex and State of Connecticut, have invented certain new and usefulImprovements in Attachments for Raising and Lowering Desks; and I dohereby declare that the following is a full, clear, and exactdescription thereof, whereby a person skilled in the art can make anduse the same, reference being bad to the accompanying drawings, and tothe letters of reference marked thereon.

Like letters in the figures indicate the same parts.

My improvement relates to a mechanism to be attached to ordinary desks,so that they can be raised or lowered to adapt them for either astanding or a sitting posture, or at any intermediate height, and tomake such changes immediately at will.

The object of my invention is to provide a mechanism for the foregoingpurpose which shall be simple and sure in its operation and notinterfere with any of the ordinary conveniences or purposes of the desk.

In the accompanying drawings, illustrating my inwention, Figure l is afront view of a desk embodying my improvement. Fig. 2 is an end view ofthe same.

A is a desk of the ordinary construction for use in a sitting posture.It is shown of the box form, having compartments or drawers at the ends,as my improvement is particularly adapted to this form of desk onaccount of the concealment of the working parts of my improvedmechanism.

B B are two bars firmly connected with the horizontal bar C. They turnupon pins at B, attached to the body of the desk, and at the other endare furnished with rollers E, which roll upon the floor.

D D are bars similar to B B, but are hinged or pivoted to the floor atD, instead of to the desk, and are furnished with rollers F at theirother ends, which rollin grooves G, formed by bars or slats attached tothe sides of the desk. These bars thus attached to the desk and floorform a parallel motion upon which the desk can move up and down, butcannot tip either forward or back.

(No model.)

H H are cars, which may be screwed or otherwise attached to the floor tosupport the pivots of the bars D.

J J are catches 0r stops formed on a plate, which is likewise screwed tothe floor to support the rollers E in any position. These catches areconvenient for assisting to support the desk firmly.

K is a Lever fixed to the horizontal bar C at one end, and therebyconnected with the bars B for operating and extending the parallelmotion B D and raising the desk. When the desk is lowered the lever Ktips backward, and when it is raised it is moved forward. When pulledforward to raise the desk it is held by one ofa series of hooks, L L, tosustain the desk at different heights. The hooks L are attached to ametallic strip secured to the side of the desk. It is intended that thecatches J shall be in such a position that the roller E will be heldwhen the lever K is in one of the hooks L, so that they act together insupporting the weight.

M is a notch in the bottom of the desk to allow the bar C to enter whenthe desk is down, so as to rest on the floor. In this position theparallel motion by which the desk is raised is under the desk and out ofsight.

By means of my improvement an ordinary desk constructed to be used in asitting posture may be made available for standing,which for manyoccupations-such as posting books, &c.-is the most convenient.

What I claim as my invention is- 1. In combination with a desk, the barsB, pivoted to the sides of the desk and provided with rollers E, thebars 1), pivoted to the floor and provided with rollers F, thehorizontal bar 0, the lever K, and hooks L, substantially as described.

2. In the parallel-motion mechanism for raisin g desks herein described,the combination of the series of catches or stops J with the bars B, therollers E, the bars D, and the rollers F, substantially as set forth.

J. ALVIN EADES.

Witnesses:

EDWIN F. DIMOCK, 'Inno. G. ELLIs.

